4 * Exposes all configurable internal clock sources to the clk framework.
7 * - Root source, usually 12MHz supplied by an external crystal
8 * - 3 PLLs which generate multiples of root rate [AUX, CPU, AUX2]
11 * - 6 clock dividers with:
12 * * selectable source [one of the PLLs],
13 * * output divided between [2 .. 512 in steps of 2] (!Au1300)
14 * or [1 .. 256 in steps of 1] (Au1300),
15 * * can be enabled individually.
17 * - up to 6 "internal" (fixed) consumers which:
18 * * take either AUXPLL or one of the above 6 dividers as input,
19 * * divide this input by 1, 2, or 4 (and 3 on Au1300).
20 * * can be disabled separately.
23 * - sysbus clock: CPU core clock (CPUPLL) divided by 2, 3 or 4.
24 * depends on board design and should be set by bootloader, read-only.
25 * - peripheral clock: half the rate of sysbus clock, source for a lot
26 * of peripheral blocks, read-only.
27 * - memory clock: clk rate to main memory chips, depends on board
28 * design and is read-only,
29 * - lrclk: the static bus clock signal for synchronous operation.
30 * depends on board design, must be set by bootloader,
31 * but may be required to correctly configure devices attached to
32 * the static bus. The Au1000/1500/1100 manuals call it LCLK, on
33 * later models it's called RCLK.
36 #include <linux/init.h>
38 #include <linux/clk-provider.h>
39 #include <linux/clkdev.h>
40 #include <linux/clk-private.h>
41 #include <linux/slab.h>
42 #include <linux/spinlock.h>
43 #include <linux/types.h>
44 #include <asm/mach-au1x00/au1000.h>
46 /* Base clock: 12MHz is the default in all databooks, and I haven't
47 * found any board yet which uses a different rate.
49 #define ALCHEMY_ROOTCLK_RATE 12000000
52 * the internal sources which can be driven by the PLLs and dividers.
53 * Names taken from the databooks, refer to them for more information,
54 * especially which ones are share a clock line.
56 static const char * const alchemy_au1300_intclknames[] = {
57 "lcd_intclk", "gpemgp_clk", "maempe_clk", "maebsa_clk",
61 static const char * const alchemy_au1200_intclknames[] = {
62 "lcd_intclk", NULL, NULL, NULL, "EXTCLK0", "EXTCLK1"
65 static const char * const alchemy_au1550_intclknames[] = {
66 "usb_clk", "psc0_intclk", "psc1_intclk", "pci_clko",
70 static const char * const alchemy_au1100_intclknames[] = {
71 "usb_clk", "lcd_intclk", NULL, "i2s_clk", "EXTCLK0", "EXTCLK1"
74 static const char * const alchemy_au1500_intclknames[] = {
75 NULL, "usbd_clk", "usbh_clk", "pci_clko", "EXTCLK0", "EXTCLK1"
78 static const char * const alchemy_au1000_intclknames[] = {
79 "irda_clk", "usbd_clk", "usbh_clk", "i2s_clk", "EXTCLK0",
83 /* aliases for a few on-chip sources which are either shared
84 * or have gone through name changes.
86 static struct clk_aliastable {
90 } alchemy_clk_aliases[] __initdata = {
91 { "usbh_clk", "usb_clk", ALCHEMY_CPU_AU1100 },
92 { "usbd_clk", "usb_clk", ALCHEMY_CPU_AU1100 },
93 { "irda_clk", "usb_clk", ALCHEMY_CPU_AU1100 },
94 { "usbh_clk", "usb_clk", ALCHEMY_CPU_AU1550 },
95 { "usbd_clk", "usb_clk", ALCHEMY_CPU_AU1550 },
96 { "psc2_intclk", "usb_clk", ALCHEMY_CPU_AU1550 },
97 { "psc3_intclk", "EXTCLK0", ALCHEMY_CPU_AU1550 },
98 { "psc0_intclk", "EXTCLK0", ALCHEMY_CPU_AU1200 },
99 { "psc1_intclk", "EXTCLK1", ALCHEMY_CPU_AU1200 },
100 { "psc0_intclk", "EXTCLK0", ALCHEMY_CPU_AU1300 },
101 { "psc2_intclk", "EXTCLK0", ALCHEMY_CPU_AU1300 },
102 { "psc1_intclk", "EXTCLK1", ALCHEMY_CPU_AU1300 },
103 { "psc3_intclk", "EXTCLK1", ALCHEMY_CPU_AU1300 },
108 #define IOMEM(x) ((void __iomem *)(KSEG1ADDR(CPHYSADDR(x))))
110 /* access locks to SYS_FREQCTRL0/1 and SYS_CLKSRC registers */
111 static spinlock_t alchemy_clk_fg0_lock;
112 static spinlock_t alchemy_clk_fg1_lock;
113 static spinlock_t alchemy_clk_csrc_lock;
115 /* CPU Core clock *****************************************************/
117 static unsigned long alchemy_clk_cpu_recalc(struct clk_hw *hw,
118 unsigned long parent_rate)
123 * On early Au1000, sys_cpupll was write-only. Since these
124 * silicon versions of Au1000 are not sold, we don't bend
125 * over backwards trying to determine the frequency.
127 if (unlikely(au1xxx_cpu_has_pll_wo()))
130 t = alchemy_rdsys(AU1000_SYS_CPUPLL) & 0x7f;
137 static struct clk_ops alchemy_clkops_cpu = {
138 .recalc_rate = alchemy_clk_cpu_recalc,
141 static struct clk __init *alchemy_clk_setup_cpu(const char *parent_name,
144 struct clk_init_data id;
147 h = kzalloc(sizeof(*h), GFP_KERNEL);
149 return ERR_PTR(-ENOMEM);
151 id.name = ALCHEMY_CPU_CLK;
152 id.parent_names = &parent_name;
154 id.flags = CLK_IS_BASIC;
155 id.ops = &alchemy_clkops_cpu;
158 return clk_register(NULL, h);
161 /* AUXPLLs ************************************************************/
163 struct alchemy_auxpll_clk {
165 unsigned long reg; /* au1300 has also AUXPLL2 */
166 int maxmult; /* max multiplier */
168 #define to_auxpll_clk(x) container_of(x, struct alchemy_auxpll_clk, hw)
170 static unsigned long alchemy_clk_aux_recalc(struct clk_hw *hw,
171 unsigned long parent_rate)
173 struct alchemy_auxpll_clk *a = to_auxpll_clk(hw);
175 return (alchemy_rdsys(a->reg) & 0xff) * parent_rate;
178 static int alchemy_clk_aux_setr(struct clk_hw *hw,
180 unsigned long parent_rate)
182 struct alchemy_auxpll_clk *a = to_auxpll_clk(hw);
183 unsigned long d = rate;
190 /* minimum is 84MHz, max is 756-1032 depending on variant */
191 if (((d < 7) && (d != 0)) || (d > a->maxmult))
194 alchemy_wrsys(d, a->reg);
198 static long alchemy_clk_aux_roundr(struct clk_hw *hw,
200 unsigned long *parent_rate)
202 struct alchemy_auxpll_clk *a = to_auxpll_clk(hw);
205 if (!rate || !*parent_rate)
208 mult = rate / (*parent_rate);
210 if (mult && (mult < 7))
212 if (mult > a->maxmult)
215 return (*parent_rate) * mult;
218 static struct clk_ops alchemy_clkops_aux = {
219 .recalc_rate = alchemy_clk_aux_recalc,
220 .set_rate = alchemy_clk_aux_setr,
221 .round_rate = alchemy_clk_aux_roundr,
224 static struct clk __init *alchemy_clk_setup_aux(const char *parent_name,
225 char *name, int maxmult,
228 struct clk_init_data id;
230 struct alchemy_auxpll_clk *a;
232 a = kzalloc(sizeof(*a), GFP_KERNEL);
234 return ERR_PTR(-ENOMEM);
237 id.parent_names = &parent_name;
239 id.flags = CLK_GET_RATE_NOCACHE;
240 id.ops = &alchemy_clkops_aux;
243 a->maxmult = maxmult;
246 c = clk_register(NULL, &a->hw);
248 clk_register_clkdev(c, name, NULL);
255 /* sysbus_clk *********************************************************/
257 static struct clk __init *alchemy_clk_setup_sysbus(const char *pn)
259 unsigned long v = (alchemy_rdsys(AU1000_SYS_POWERCTRL) & 3) + 2;
262 c = clk_register_fixed_factor(NULL, ALCHEMY_SYSBUS_CLK,
265 clk_register_clkdev(c, ALCHEMY_SYSBUS_CLK, NULL);
269 /* Peripheral Clock ***************************************************/
271 static struct clk __init *alchemy_clk_setup_periph(const char *pn)
273 /* Peripheral clock runs at half the rate of sysbus clk */
276 c = clk_register_fixed_factor(NULL, ALCHEMY_PERIPH_CLK,
279 clk_register_clkdev(c, ALCHEMY_PERIPH_CLK, NULL);
283 /* mem clock **********************************************************/
285 static struct clk __init *alchemy_clk_setup_mem(const char *pn, int ct)
287 void __iomem *addr = IOMEM(AU1000_MEM_PHYS_ADDR);
293 case ALCHEMY_CPU_AU1550:
294 case ALCHEMY_CPU_AU1200:
295 v = __raw_readl(addr + AU1550_MEM_SDCONFIGB);
296 div = (v & (1 << 15)) ? 1 : 2;
298 case ALCHEMY_CPU_AU1300:
299 v = __raw_readl(addr + AU1550_MEM_SDCONFIGB);
300 div = (v & (1 << 31)) ? 1 : 2;
302 case ALCHEMY_CPU_AU1000:
303 case ALCHEMY_CPU_AU1500:
304 case ALCHEMY_CPU_AU1100:
310 c = clk_register_fixed_factor(NULL, ALCHEMY_MEM_CLK, pn,
313 clk_register_clkdev(c, ALCHEMY_MEM_CLK, NULL);
317 /* lrclk: external synchronous static bus clock ***********************/
319 static struct clk __init *alchemy_clk_setup_lrclk(const char *pn)
321 /* MEM_STCFG0[15:13] = divisor.
322 * L/RCLK = periph_clk / (divisor + 1)
323 * On Au1000, Au1500, Au1100 it's called LCLK,
324 * on later models it's called RCLK, but it's the same thing.
327 unsigned long v = alchemy_rdsmem(AU1000_MEM_STCFG0) >> 13;
330 c = clk_register_fixed_factor(NULL, ALCHEMY_LR_CLK,
333 clk_register_clkdev(c, ALCHEMY_LR_CLK, NULL);
337 /* Clock dividers and muxes *******************************************/
339 /* data for fgen and csrc mux-dividers */
340 struct alchemy_fgcs_clk {
342 spinlock_t *reglock; /* register lock */
343 unsigned long reg; /* SYS_FREQCTRL0/1 */
344 int shift; /* offset in register */
345 int parent; /* parent before disable [Au1300] */
346 int isen; /* is it enabled? */
347 int *dt; /* dividertable for csrc */
349 #define to_fgcs_clk(x) container_of(x, struct alchemy_fgcs_clk, hw)
351 static long alchemy_calc_div(unsigned long rate, unsigned long prate,
352 int scale, int maxdiv, unsigned long *rv)
357 if ((prate / div1) > rate)
360 if (scale == 2) { /* only div-by-multiple-of-2 possible */
362 div1++; /* stay <=prate */
365 div2 = (div1 / scale) - 1; /* value to write to register */
372 div1 = ((div2 + 1) * scale);
376 static long alchemy_clk_fgcs_detr(struct clk_hw *hw, unsigned long rate,
377 unsigned long *best_parent_rate,
378 struct clk_hw **best_parent_clk,
379 int scale, int maxdiv)
381 struct clk *pc, *bpc, *free;
382 long tdv, tpr, pr, nr, br, bpr, diff, lastdiff;
391 /* look at the rates each enabled parent supplies and select
392 * the one that gets closest to but not over the requested rate.
394 for (j = 0; j < 7; j++) {
395 pc = clk_get_parent_by_index(hw->clk, j);
399 /* if this parent is currently unused, remember it.
400 * XXX: I know it's a layering violation, but it works
401 * so well.. (if (!clk_has_active_children(pc)) )
403 if (pc->prepare_count == 0) {
408 pr = clk_get_rate(pc);
412 /* what can hardware actually provide */
413 tdv = alchemy_calc_div(rate, pr, scale, maxdiv, NULL);
419 if (diff < lastdiff) {
429 /* if we couldn't get the exact rate we wanted from the enabled
430 * parents, maybe we can tell an available disabled/inactive one
431 * to give us a rate we can divide down to the requested rate.
433 if (lastdiff && free) {
434 for (j = (maxdiv == 4) ? 1 : scale; j <= maxdiv; j += scale) {
438 pr = clk_round_rate(free, tpr);
440 tdv = alchemy_calc_div(rate, pr, scale, maxdiv, NULL);
445 if (diff < lastdiff) {
456 *best_parent_rate = bpr;
457 *best_parent_clk = __clk_get_hw(bpc);
461 static int alchemy_clk_fgv1_en(struct clk_hw *hw)
463 struct alchemy_fgcs_clk *c = to_fgcs_clk(hw);
464 unsigned long v, flags;
466 spin_lock_irqsave(c->reglock, flags);
467 v = alchemy_rdsys(c->reg);
468 v |= (1 << 1) << c->shift;
469 alchemy_wrsys(v, c->reg);
470 spin_unlock_irqrestore(c->reglock, flags);
475 static int alchemy_clk_fgv1_isen(struct clk_hw *hw)
477 struct alchemy_fgcs_clk *c = to_fgcs_clk(hw);
478 unsigned long v = alchemy_rdsys(c->reg) >> (c->shift + 1);
483 static void alchemy_clk_fgv1_dis(struct clk_hw *hw)
485 struct alchemy_fgcs_clk *c = to_fgcs_clk(hw);
486 unsigned long v, flags;
488 spin_lock_irqsave(c->reglock, flags);
489 v = alchemy_rdsys(c->reg);
490 v &= ~((1 << 1) << c->shift);
491 alchemy_wrsys(v, c->reg);
492 spin_unlock_irqrestore(c->reglock, flags);
495 static int alchemy_clk_fgv1_setp(struct clk_hw *hw, u8 index)
497 struct alchemy_fgcs_clk *c = to_fgcs_clk(hw);
498 unsigned long v, flags;
500 spin_lock_irqsave(c->reglock, flags);
501 v = alchemy_rdsys(c->reg);
503 v |= (1 << c->shift);
505 v &= ~(1 << c->shift);
506 alchemy_wrsys(v, c->reg);
507 spin_unlock_irqrestore(c->reglock, flags);
512 static u8 alchemy_clk_fgv1_getp(struct clk_hw *hw)
514 struct alchemy_fgcs_clk *c = to_fgcs_clk(hw);
516 return (alchemy_rdsys(c->reg) >> c->shift) & 1;
519 static int alchemy_clk_fgv1_setr(struct clk_hw *hw, unsigned long rate,
520 unsigned long parent_rate)
522 struct alchemy_fgcs_clk *c = to_fgcs_clk(hw);
523 unsigned long div, v, flags, ret;
524 int sh = c->shift + 2;
526 if (!rate || !parent_rate || rate > (parent_rate / 2))
528 ret = alchemy_calc_div(rate, parent_rate, 2, 512, &div);
529 spin_lock_irqsave(c->reglock, flags);
530 v = alchemy_rdsys(c->reg);
533 alchemy_wrsys(v, c->reg);
534 spin_unlock_irqrestore(c->reglock, flags);
539 static unsigned long alchemy_clk_fgv1_recalc(struct clk_hw *hw,
540 unsigned long parent_rate)
542 struct alchemy_fgcs_clk *c = to_fgcs_clk(hw);
543 unsigned long v = alchemy_rdsys(c->reg) >> (c->shift + 2);
545 v = ((v & 0xff) + 1) * 2;
546 return parent_rate / v;
549 static long alchemy_clk_fgv1_detr(struct clk_hw *hw, unsigned long rate,
550 unsigned long *best_parent_rate,
551 struct clk_hw **best_parent_clk)
553 return alchemy_clk_fgcs_detr(hw, rate, best_parent_rate,
554 best_parent_clk, 2, 512);
557 /* Au1000, Au1100, Au15x0, Au12x0 */
558 static struct clk_ops alchemy_clkops_fgenv1 = {
559 .recalc_rate = alchemy_clk_fgv1_recalc,
560 .determine_rate = alchemy_clk_fgv1_detr,
561 .set_rate = alchemy_clk_fgv1_setr,
562 .set_parent = alchemy_clk_fgv1_setp,
563 .get_parent = alchemy_clk_fgv1_getp,
564 .enable = alchemy_clk_fgv1_en,
565 .disable = alchemy_clk_fgv1_dis,
566 .is_enabled = alchemy_clk_fgv1_isen,
569 static void __alchemy_clk_fgv2_en(struct alchemy_fgcs_clk *c)
571 unsigned long v = alchemy_rdsys(c->reg);
573 v &= ~(3 << c->shift);
574 v |= (c->parent & 3) << c->shift;
575 alchemy_wrsys(v, c->reg);
579 static int alchemy_clk_fgv2_en(struct clk_hw *hw)
581 struct alchemy_fgcs_clk *c = to_fgcs_clk(hw);
584 /* enable by setting the previous parent clock */
585 spin_lock_irqsave(c->reglock, flags);
586 __alchemy_clk_fgv2_en(c);
587 spin_unlock_irqrestore(c->reglock, flags);
592 static int alchemy_clk_fgv2_isen(struct clk_hw *hw)
594 struct alchemy_fgcs_clk *c = to_fgcs_clk(hw);
596 return ((alchemy_rdsys(c->reg) >> c->shift) & 3) != 0;
599 static void alchemy_clk_fgv2_dis(struct clk_hw *hw)
601 struct alchemy_fgcs_clk *c = to_fgcs_clk(hw);
602 unsigned long v, flags;
604 spin_lock_irqsave(c->reglock, flags);
605 v = alchemy_rdsys(c->reg);
606 v &= ~(3 << c->shift); /* set input mux to "disabled" state */
607 alchemy_wrsys(v, c->reg);
609 spin_unlock_irqrestore(c->reglock, flags);
612 static int alchemy_clk_fgv2_setp(struct clk_hw *hw, u8 index)
614 struct alchemy_fgcs_clk *c = to_fgcs_clk(hw);
617 spin_lock_irqsave(c->reglock, flags);
618 c->parent = index + 1; /* value to write to register */
620 __alchemy_clk_fgv2_en(c);
621 spin_unlock_irqrestore(c->reglock, flags);
626 static u8 alchemy_clk_fgv2_getp(struct clk_hw *hw)
628 struct alchemy_fgcs_clk *c = to_fgcs_clk(hw);
629 unsigned long flags, v;
631 spin_lock_irqsave(c->reglock, flags);
633 spin_unlock_irqrestore(c->reglock, flags);
637 /* fg0-2 and fg4-6 share a "scale"-bit. With this bit cleared, the
638 * dividers behave exactly as on previous models (dividers are multiples
639 * of 2); with the bit set, dividers are multiples of 1, halving their
640 * range, but making them also much more flexible.
642 static int alchemy_clk_fgv2_setr(struct clk_hw *hw, unsigned long rate,
643 unsigned long parent_rate)
645 struct alchemy_fgcs_clk *c = to_fgcs_clk(hw);
646 int sh = c->shift + 2;
647 unsigned long div, v, flags, ret;
649 if (!rate || !parent_rate || rate > parent_rate)
652 v = alchemy_rdsys(c->reg) & (1 << 30); /* test "scale" bit */
653 ret = alchemy_calc_div(rate, parent_rate, v ? 1 : 2,
654 v ? 256 : 512, &div);
656 spin_lock_irqsave(c->reglock, flags);
657 v = alchemy_rdsys(c->reg);
659 v |= (div & 0xff) << sh;
660 alchemy_wrsys(v, c->reg);
661 spin_unlock_irqrestore(c->reglock, flags);
666 static unsigned long alchemy_clk_fgv2_recalc(struct clk_hw *hw,
667 unsigned long parent_rate)
669 struct alchemy_fgcs_clk *c = to_fgcs_clk(hw);
670 int sh = c->shift + 2;
673 v = alchemy_rdsys(c->reg);
674 t = parent_rate / (((v >> sh) & 0xff) + 1);
675 if ((v & (1 << 30)) == 0) /* test scale bit */
681 static long alchemy_clk_fgv2_detr(struct clk_hw *hw, unsigned long rate,
682 unsigned long *best_parent_rate,
683 struct clk_hw **best_parent_clk)
685 struct alchemy_fgcs_clk *c = to_fgcs_clk(hw);
688 if (alchemy_rdsys(c->reg) & (1 << 30)) {
696 return alchemy_clk_fgcs_detr(hw, rate, best_parent_rate,
697 best_parent_clk, scale, maxdiv);
700 /* Au1300 larger input mux, no separate disable bit, flexible divider */
701 static struct clk_ops alchemy_clkops_fgenv2 = {
702 .recalc_rate = alchemy_clk_fgv2_recalc,
703 .determine_rate = alchemy_clk_fgv2_detr,
704 .set_rate = alchemy_clk_fgv2_setr,
705 .set_parent = alchemy_clk_fgv2_setp,
706 .get_parent = alchemy_clk_fgv2_getp,
707 .enable = alchemy_clk_fgv2_en,
708 .disable = alchemy_clk_fgv2_dis,
709 .is_enabled = alchemy_clk_fgv2_isen,
712 static const char * const alchemy_clk_fgv1_parents[] = {
713 ALCHEMY_CPU_CLK, ALCHEMY_AUXPLL_CLK
716 static const char * const alchemy_clk_fgv2_parents[] = {
717 ALCHEMY_AUXPLL2_CLK, ALCHEMY_CPU_CLK, ALCHEMY_AUXPLL_CLK
720 static const char * const alchemy_clk_fgen_names[] = {
721 ALCHEMY_FG0_CLK, ALCHEMY_FG1_CLK, ALCHEMY_FG2_CLK,
722 ALCHEMY_FG3_CLK, ALCHEMY_FG4_CLK, ALCHEMY_FG5_CLK };
724 static int __init alchemy_clk_init_fgens(int ctype)
727 struct clk_init_data id;
728 struct alchemy_fgcs_clk *a;
733 case ALCHEMY_CPU_AU1000...ALCHEMY_CPU_AU1200:
734 id.ops = &alchemy_clkops_fgenv1;
735 id.parent_names = (const char **)alchemy_clk_fgv1_parents;
738 case ALCHEMY_CPU_AU1300:
739 id.ops = &alchemy_clkops_fgenv2;
740 id.parent_names = (const char **)alchemy_clk_fgv2_parents;
746 id.flags = CLK_SET_RATE_PARENT | CLK_GET_RATE_NOCACHE;
748 a = kzalloc((sizeof(*a)) * 6, GFP_KERNEL);
752 spin_lock_init(&alchemy_clk_fg0_lock);
753 spin_lock_init(&alchemy_clk_fg1_lock);
755 for (i = 0; i < 6; i++) {
756 id.name = alchemy_clk_fgen_names[i];
757 a->shift = 10 * (i < 3 ? i : i - 3);
759 a->reg = AU1000_SYS_FREQCTRL1;
760 a->reglock = &alchemy_clk_fg1_lock;
762 a->reg = AU1000_SYS_FREQCTRL0;
763 a->reglock = &alchemy_clk_fg0_lock;
766 /* default to first parent if bootloader has set
767 * the mux to disabled state.
769 if (ctype == ALCHEMY_CPU_AU1300) {
770 v = alchemy_rdsys(a->reg);
771 a->parent = (v >> a->shift) & 3;
780 c = clk_register(NULL, &a->hw);
784 clk_register_clkdev(c, id.name, NULL);
791 /* internal sources muxes *********************************************/
793 static int alchemy_clk_csrc_isen(struct clk_hw *hw)
795 struct alchemy_fgcs_clk *c = to_fgcs_clk(hw);
796 unsigned long v = alchemy_rdsys(c->reg);
798 return (((v >> c->shift) >> 2) & 7) != 0;
801 static void __alchemy_clk_csrc_en(struct alchemy_fgcs_clk *c)
803 unsigned long v = alchemy_rdsys(c->reg);
805 v &= ~((7 << 2) << c->shift);
806 v |= ((c->parent & 7) << 2) << c->shift;
807 alchemy_wrsys(v, c->reg);
811 static int alchemy_clk_csrc_en(struct clk_hw *hw)
813 struct alchemy_fgcs_clk *c = to_fgcs_clk(hw);
816 /* enable by setting the previous parent clock */
817 spin_lock_irqsave(c->reglock, flags);
818 __alchemy_clk_csrc_en(c);
819 spin_unlock_irqrestore(c->reglock, flags);
824 static void alchemy_clk_csrc_dis(struct clk_hw *hw)
826 struct alchemy_fgcs_clk *c = to_fgcs_clk(hw);
827 unsigned long v, flags;
829 spin_lock_irqsave(c->reglock, flags);
830 v = alchemy_rdsys(c->reg);
831 v &= ~((3 << 2) << c->shift); /* mux to "disabled" state */
832 alchemy_wrsys(v, c->reg);
834 spin_unlock_irqrestore(c->reglock, flags);
837 static int alchemy_clk_csrc_setp(struct clk_hw *hw, u8 index)
839 struct alchemy_fgcs_clk *c = to_fgcs_clk(hw);
842 spin_lock_irqsave(c->reglock, flags);
843 c->parent = index + 1; /* value to write to register */
845 __alchemy_clk_csrc_en(c);
846 spin_unlock_irqrestore(c->reglock, flags);
851 static u8 alchemy_clk_csrc_getp(struct clk_hw *hw)
853 struct alchemy_fgcs_clk *c = to_fgcs_clk(hw);
855 return c->parent - 1;
858 static unsigned long alchemy_clk_csrc_recalc(struct clk_hw *hw,
859 unsigned long parent_rate)
861 struct alchemy_fgcs_clk *c = to_fgcs_clk(hw);
862 unsigned long v = (alchemy_rdsys(c->reg) >> c->shift) & 3;
864 return parent_rate / c->dt[v];
867 static int alchemy_clk_csrc_setr(struct clk_hw *hw, unsigned long rate,
868 unsigned long parent_rate)
870 struct alchemy_fgcs_clk *c = to_fgcs_clk(hw);
871 unsigned long d, v, flags;
874 if (!rate || !parent_rate || rate > parent_rate)
877 d = (parent_rate + (rate / 2)) / rate;
880 if ((d == 3) && (c->dt[2] != 3))
883 for (i = 0; i < 4; i++)
888 return -EINVAL; /* oops */
890 spin_lock_irqsave(c->reglock, flags);
891 v = alchemy_rdsys(c->reg);
892 v &= ~(3 << c->shift);
893 v |= (i & 3) << c->shift;
894 alchemy_wrsys(v, c->reg);
895 spin_unlock_irqrestore(c->reglock, flags);
900 static long alchemy_clk_csrc_detr(struct clk_hw *hw, unsigned long rate,
901 unsigned long *best_parent_rate,
902 struct clk_hw **best_parent_clk)
904 struct alchemy_fgcs_clk *c = to_fgcs_clk(hw);
905 int scale = c->dt[2] == 3 ? 1 : 2; /* au1300 check */
907 return alchemy_clk_fgcs_detr(hw, rate, best_parent_rate,
908 best_parent_clk, scale, 4);
911 static struct clk_ops alchemy_clkops_csrc = {
912 .recalc_rate = alchemy_clk_csrc_recalc,
913 .determine_rate = alchemy_clk_csrc_detr,
914 .set_rate = alchemy_clk_csrc_setr,
915 .set_parent = alchemy_clk_csrc_setp,
916 .get_parent = alchemy_clk_csrc_getp,
917 .enable = alchemy_clk_csrc_en,
918 .disable = alchemy_clk_csrc_dis,
919 .is_enabled = alchemy_clk_csrc_isen,
922 static const char * const alchemy_clk_csrc_parents[] = {
923 /* disabled at index 0 */ ALCHEMY_AUXPLL_CLK,
924 ALCHEMY_FG0_CLK, ALCHEMY_FG1_CLK, ALCHEMY_FG2_CLK,
925 ALCHEMY_FG3_CLK, ALCHEMY_FG4_CLK, ALCHEMY_FG5_CLK
929 static int alchemy_csrc_dt1[] = { 1, 4, 1, 2 }; /* rest */
930 static int alchemy_csrc_dt2[] = { 1, 4, 3, 2 }; /* Au1300 */
932 static int __init alchemy_clk_setup_imux(int ctype)
934 struct alchemy_fgcs_clk *a;
935 const char * const *names;
936 struct clk_init_data id;
941 id.ops = &alchemy_clkops_csrc;
942 id.parent_names = (const char **)alchemy_clk_csrc_parents;
944 id.flags = CLK_SET_RATE_PARENT | CLK_GET_RATE_NOCACHE;
946 dt = alchemy_csrc_dt1;
948 case ALCHEMY_CPU_AU1000:
949 names = alchemy_au1000_intclknames;
951 case ALCHEMY_CPU_AU1500:
952 names = alchemy_au1500_intclknames;
954 case ALCHEMY_CPU_AU1100:
955 names = alchemy_au1100_intclknames;
957 case ALCHEMY_CPU_AU1550:
958 names = alchemy_au1550_intclknames;
960 case ALCHEMY_CPU_AU1200:
961 names = alchemy_au1200_intclknames;
963 case ALCHEMY_CPU_AU1300:
964 dt = alchemy_csrc_dt2;
965 names = alchemy_au1300_intclknames;
971 a = kzalloc((sizeof(*a)) * 6, GFP_KERNEL);
975 spin_lock_init(&alchemy_clk_csrc_lock);
978 for (i = 0; i < 6; i++) {
984 a->reg = AU1000_SYS_CLKSRC;
985 a->reglock = &alchemy_clk_csrc_lock;
988 /* default to first parent clock if mux is initially
989 * set to disabled state.
991 v = alchemy_rdsys(a->reg);
992 a->parent = ((v >> a->shift) >> 2) & 7;
1000 c = clk_register(NULL, &a->hw);
1004 clk_register_clkdev(c, id.name, NULL);
1013 /**********************************************************************/
1022 static int __init alchemy_clk_init(void)
1024 int ctype = alchemy_get_cputype(), ret, i;
1025 struct clk_aliastable *t = alchemy_clk_aliases;
1028 /* Root of the Alchemy clock tree: external 12MHz crystal osc */
1029 c = clk_register_fixed_rate(NULL, ALCHEMY_ROOT_CLK, NULL,
1031 ALCHEMY_ROOTCLK_RATE);
1034 /* CPU core clock */
1035 c = alchemy_clk_setup_cpu(ALCHEMY_ROOT_CLK, ctype);
1038 /* AUXPLLs: max 1GHz on Au1300, 748MHz on older models */
1039 i = (ctype == ALCHEMY_CPU_AU1300) ? 84 : 63;
1040 c = alchemy_clk_setup_aux(ALCHEMY_ROOT_CLK, ALCHEMY_AUXPLL_CLK,
1041 i, AU1000_SYS_AUXPLL);
1044 if (ctype == ALCHEMY_CPU_AU1300) {
1045 c = alchemy_clk_setup_aux(ALCHEMY_ROOT_CLK,
1046 ALCHEMY_AUXPLL2_CLK, i,
1047 AU1300_SYS_AUXPLL2);
1051 /* sysbus clock: cpu core clock divided by 2, 3 or 4 */
1052 c = alchemy_clk_setup_sysbus(ALCHEMY_CPU_CLK);
1055 /* peripheral clock: runs at half rate of sysbus clk */
1056 c = alchemy_clk_setup_periph(ALCHEMY_SYSBUS_CLK);
1059 /* SDR/DDR memory clock */
1060 c = alchemy_clk_setup_mem(ALCHEMY_SYSBUS_CLK, ctype);
1063 /* L/RCLK: external static bus clock for synchronous mode */
1064 c = alchemy_clk_setup_lrclk(ALCHEMY_PERIPH_CLK);
1067 /* Frequency dividers 0-5 */
1068 ret = alchemy_clk_init_fgens(ctype);
1074 /* diving muxes for internal sources */
1075 ret = alchemy_clk_setup_imux(ctype);
1081 /* set up aliases drivers might look for */
1083 if (t->cputype == ctype)
1084 clk_add_alias(t->alias, NULL, t->base, NULL);
1088 pr_info("Alchemy clocktree installed\n");
1094 postcore_initcall(alchemy_clk_init);